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| author | Takashi Sakamoto <o-takashi@sakamocchi.jp> | 2019-10-30 17:06:42 +0900 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2019-10-30 10:57:56 +0100 |
| commit | 4b2079f80aa065b237955e75d0b627943656b0ab (patch) | |
| tree | c246c63057c1e8b16c2a8da79166eb21557dfb3a | |
| parent | 3f58f004bff3273d102583e0b2f478526cf9d3c8 (diff) | |
| download | lwn-4b2079f80aa065b237955e75d0b627943656b0ab.tar.gz lwn-4b2079f80aa065b237955e75d0b627943656b0ab.zip | |
ALSA: firewire-motu: minor code refactoring for protocol version 2
This commit adds some helper functions to parse register value for
source of sampling clock and nominal sampling transmission frequency.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20191030080644.1704-5-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
| -rw-r--r-- | sound/firewire/motu/motu-protocol-v2.c | 65 |
1 files changed, 39 insertions, 26 deletions
diff --git a/sound/firewire/motu/motu-protocol-v2.c b/sound/firewire/motu/motu-protocol-v2.c index 2757e5b42b9b..cb0e58a9f33d 100644 --- a/sound/firewire/motu/motu-protocol-v2.c +++ b/sound/firewire/motu/motu-protocol-v2.c @@ -26,10 +26,20 @@ #define V2_OPT_IFACE_MODE_ADAT 1 #define V2_OPT_IFACE_MODE_SPDIF 2 +static int get_clock_rate(u32 data, unsigned int *rate) +{ + unsigned int index = (data & V2_CLOCK_RATE_MASK) >> V2_CLOCK_RATE_SHIFT; + if (index >= ARRAY_SIZE(snd_motu_clock_rates)) + return -EIO; + + *rate = snd_motu_clock_rates[index]; + + return 0; +} + static int v2_get_clock_rate(struct snd_motu *motu, unsigned int *rate) { __be32 reg; - unsigned int index; int err; err = snd_motu_transaction_read(motu, V2_CLOCK_STATUS_OFFSET, ®, @@ -37,13 +47,7 @@ static int v2_get_clock_rate(struct snd_motu *motu, unsigned int *rate) if (err < 0) return err; - index = (be32_to_cpu(reg) & V2_CLOCK_RATE_MASK) >> V2_CLOCK_RATE_SHIFT; - if (index >= ARRAY_SIZE(snd_motu_clock_rates)) - return -EIO; - - *rate = snd_motu_clock_rates[index]; - - return 0; + return get_clock_rate(be32_to_cpu(reg), rate); } static int v2_set_clock_rate(struct snd_motu *motu, unsigned int rate) @@ -79,38 +83,33 @@ static int v2_set_clock_rate(struct snd_motu *motu, unsigned int rate) sizeof(reg)); } -static int v2_get_clock_source(struct snd_motu *motu, - enum snd_motu_clock_source *src) +static int get_clock_source(struct snd_motu *motu, u32 data, + enum snd_motu_clock_source *src) { - __be32 reg; - unsigned int index; - int err; - - err = snd_motu_transaction_read(motu, V2_CLOCK_STATUS_OFFSET, ®, - sizeof(reg)); - if (err < 0) - return err; - - index = be32_to_cpu(reg) & V2_CLOCK_SRC_MASK; + unsigned int index = data & V2_CLOCK_SRC_MASK; if (index > 5) return -EIO; - /* To check the configuration of optical interface. */ - err = snd_motu_transaction_read(motu, V2_IN_OUT_CONF_OFFSET, ®, - sizeof(reg)); - if (err < 0) - return err; - switch (index) { case 0: *src = SND_MOTU_CLOCK_SOURCE_INTERNAL; break; case 1: + { + __be32 reg; + + // To check the configuration of optical interface. + int err = snd_motu_transaction_read(motu, V2_IN_OUT_CONF_OFFSET, + ®, sizeof(reg)); + if (err < 0) + return err; + if (be32_to_cpu(reg) & 0x00000200) *src = SND_MOTU_CLOCK_SOURCE_SPDIF_ON_OPT; else *src = SND_MOTU_CLOCK_SOURCE_ADAT_ON_OPT; break; + } case 2: *src = SND_MOTU_CLOCK_SOURCE_SPDIF_ON_COAX; break; @@ -130,6 +129,20 @@ static int v2_get_clock_source(struct snd_motu *motu, return 0; } +static int v2_get_clock_source(struct snd_motu *motu, + enum snd_motu_clock_source *src) +{ + __be32 reg; + int err; + + err = snd_motu_transaction_read(motu, V2_CLOCK_STATUS_OFFSET, ®, + sizeof(reg)); + if (err < 0) + return err; + + return get_clock_source(motu, be32_to_cpu(reg), src); +} + static int v2_switch_fetching_mode(struct snd_motu *motu, bool enable) { __be32 reg; |